mike0chek Posted August 18, 2012 Report Share Posted August 18, 2012 hey guys just gettin my cub dialed in and was looking for some opinions, 35mm carbs with 160 mains and clip in middle of needle. im getting a strong hesitation right before the powerband. is this something that can be fixed by adjusting needle height??? if i rev it past the hesitation it hauls ass all the way to the end of the gear. Uploaded with ImageShack.us Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted August 18, 2012 Report Share Posted August 18, 2012 What pilots? Quote Link to comment Share on other sites More sharing options...
mike0chek Posted August 18, 2012 Author Report Share Posted August 18, 2012 52 pilots, there def too fat but the bike will idle with the idle screws turned all the way in. Quote Link to comment Share on other sites More sharing options...
mike0chek Posted August 18, 2012 Author Report Share Posted August 18, 2012 and forgot to mention air screws are 2 turns out. Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted August 19, 2012 Report Share Posted August 19, 2012 52 pilot is too big. That's causing your bog. You need 45 or 48 pilots. Quote Link to comment Share on other sites More sharing options...
Oregon dunner Posted August 19, 2012 Report Share Posted August 19, 2012 Looks a little fat to me. I just got back from Winchester bay on the Oregon coast. I also have a 421 cub with a HJR aggressive port. I have a 152 main jet and I went from a 52 to a 50 pilot because I am getting a hesitation right before the power band. I adjusted the needle to the 3 clip (Cel) and it seemed to get better. Other then that the bike ran real good. I am going to put in a 48 pilot next trip and maybe drop the needle down one more clip. Quote Link to comment Share on other sites More sharing options...
mike0chek Posted August 19, 2012 Author Report Share Posted August 19, 2012 52 pilot is too big. That's causing your bog. You need 45 or 48 pilots. ok right on thanks, i didnt know the pilots effected performance higher than 1/8 throttle or so Quote Link to comment Share on other sites More sharing options...
mike0chek Posted August 19, 2012 Author Report Share Posted August 19, 2012 Looks a little fat to me. I just got back from Winchester bay on the Oregon coast. I also have a 421 cub with a HJR aggressive port. I have a 152 main jet and I went from a 52 to a 50 pilot because I am getting a hesitation right before the power band. I adjusted the needle to the 3 clip (Cel) and it seemed to get better. Other then that the bike ran real good. I am going to put in a 48 pilot next trip and maybe drop the needle down one more clip. awsome good to know. i was going to play with the needles tomorrow but if my pilots are that far off than ill have to order them first. Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted August 19, 2012 Report Share Posted August 19, 2012 ok right on thanks, i didnt know the pilots effected performance higher than 1/8 throttle or so The jet circuits are more closely related than most people realize. Quote Link to comment Share on other sites More sharing options...
vulvafan537240 Posted August 19, 2012 Report Share Posted August 19, 2012 awsome good to know. i was going to play with the needles tomorrow but if my pilots are that far off than ill have to order them first. let us know what you find. i may try 50 pilots too. Quote Link to comment Share on other sites More sharing options...
fastforworddad Posted August 19, 2012 Report Share Posted August 19, 2012 I am running 48 pilots, 160 mains, cel needles on 4th clip from top, 4 mil cub, sea level, temp 100*F+, humidity 80%+, also have hesitation before power band. My plugs look alot like yours but many shades darker and hardly any coloration on base ring, but plenty on electrode and porcelain. Waiting for smaller jets to arrive. Whats your elevation and temps when riding? Correct me if I am wrong but read the way to dial in pilots is to turn air screws in or out until the fastest idle is achieved, more than two turns out install smaller pilots, less than 2 turns out install larger pilots. Then when you are done, readjust your idle to its happy place. Is this method the accepted practice for pilot sizing? Is this how you are sizing your pilots? If not what is your method? Quote Link to comment Share on other sites More sharing options...
mike0chek Posted August 19, 2012 Author Report Share Posted August 19, 2012 (edited) I am running 48 pilots, 160 mains, cel needles on 4th clip from top, 4 mil cub, sea level, temp 100*F+, humidity 80%+, also have hesitation before power band. My plugs look alot like yours but many shades darker and hardly any coloration on base ring, but plenty on electrode and porcelain. Waiting for smaller jets to arrive. Whats your elevation and temps when riding? Correct me if I am wrong but read the way to dial in pilots is to turn air screws in or out until the fastest idle is achieved, more than two turns out install smaller pilots, less than 2 turns out install larger pilots. Then when you are done, readjust your idle to its happy place. Is this method the accepted practice for pilot sizing? Is this how you are sizing your pilots? If not what is your method? usually around 25-30 degrees cel. tryed getting my elevation from google earth and got 80ft, not sure if thats right. the 160 main feels good up top. sizing pilot jets is pretty new to me and 52 is the smallest i have now, ill have to play with my air screws and see if theres any difference, im at 2 turns out now. let me know how you make out, seems odd that were both getting hesitation with the diff size pilots. have you tried moving your needle clip? Edited August 19, 2012 by mike0chek Quote Link to comment Share on other sites More sharing options...
fastforworddad Posted August 19, 2012 Report Share Posted August 19, 2012 Yeah, I am running the CEL needles on the forth clip from the top so it should be a little richer in the midrange. Quote Link to comment Share on other sites More sharing options...
mike0chek Posted August 19, 2012 Author Report Share Posted August 19, 2012 play around with your pilot and needle. sometimes a bog under load can be a lean one as well.... rich pilot for sure... however your mid range stumble may be something else. im gonna raise my needle up a notch today and see if it helps, i can also turn my air screws out another full turn for now until i get some smaller pilots. Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted August 20, 2012 Report Share Posted August 20, 2012 Change one thing at a time. Otherwise you won't know what's doing what. Start with the pilot. Quote Link to comment Share on other sites More sharing options...
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